Starch-Cellulose-Based Triboelectric Nanogenerator Obtained by a Low-Cost Cleanroom-Free Processing Method
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.652
Starch-Cellulose-Based Triboelectric Nanogenerator Obtained by a Low-Cost Cleanroom-Free Processing Method Robert Ccorahua1, Alexsandra Cordero1, Clemente Luyo2, María Quintana1,2, Emir Vela1,3*. 1
Department of Engineering, School of Engineering, and Laboratorios de Investigacion y Desarrollo – LID, Universidad Peruana Cayetano Heredia, Lima, Peru.
2
Department of Physical Engineering, Universidad Nacional de Ingeniería, Lima, Peru.
3
Department of Electrical and Computer Engineering, The University of New Mexico, USA.
To date only few low-cost bio-based materials have been reported to be useful as TENGs. However, they still keep employing costly nanofabrication techniques. Herein, a new biobased starch-cellulose TENG is fabricated without using complex equipment for the first time. Our results showed that, depending on the film thickness, electric outputs varied from 60 mV to 300 mV per 4 cm2 area. The thicker the film, the lower the electrical outputs, and vice versa. Moreover, FTIR-ATR analysis also showed that no chemical modification was made on the surface of starch after casting. Therefore, starch remained unmodified at the time of characterization, being this performance proper of a pristine starch. In addition, though organic starch isolation, fabrication of the proposed TENG was entirely handmade, thus avoiding use of complex equipment of nano- and micro-fabrication which resulted in the development of an eco-friendly TENG with very good performance according to the state-ofthe-art.
INTRODUCTION: Triboelectric nanogenerators (TENGs) have become one of the most sustainable ways to transform mechanical energy to electrical energy. To date, fabrication of TENGs often requires use of expensive instruments, costly materials and complex methods. Some attempts to reduce costs in material, to lower fabrication complexity and to avoid environmental pollution, employed biomaterials of cellulose and chitosan as dielectric films for TENGs [1,2]. Nevertheless, only few low-cost bio-based materials have been
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reported to be useful as TENGs and they still keep employing expensive nanofabrication techniques. According to Zimmermann [3], cellulose is the most abundant natural polymer on earth. Due to its availability and renewability, cellulose has been used to prepare wide spectra of devices, as electrodes or electrolytes [4], with improved mechanical and electrical properties [5,6]. Cellulose esters have high crystallinity [7], and a highly hydrophilic characteristic due to the many hydroxyl groups on the surface [8]. Its crystallinity gives high strength and its functional groups grants high capability of triboelectrification. On the other hand, starch is a highly biocompatible and biodegradable
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